/*
* Copyright 2001-2004 The Apache Software Foundation.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/*
* $Id: UnresolvedRef.java,v 1.6 2004/02/16 22:25:10 minchau Exp $
*/
package com.sun.org.apache.xalan.internal.xsltc.compiler;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ClassGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.ErrorMsg;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.MethodGenerator;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.Type;
import com.sun.org.apache.xalan.internal.xsltc.compiler.util.TypeCheckError;
/**
* @author Morten Jorgensen
*/
final class UnresolvedRef extends VariableRefBase {
private QName _variableName = null;
private VariableRefBase _ref = null;
private VariableBase _var = null;
private Stylesheet _sheet = null;
public UnresolvedRef(QName name) {
super();
_variableName = name;
_sheet = getStylesheet();
}
public QName getName() {
return(_variableName);
}
private ErrorMsg reportError() {
ErrorMsg err = new ErrorMsg(ErrorMsg.VARIABLE_UNDEF_ERR,
_variableName, this);
getParser().reportError(Constants.ERROR, err);
return(err);
}
private VariableRefBase resolve(Parser parser, SymbolTable stable) {
// At this point the AST is already built and we should be able to
// find any declared global variable or parameter
VariableBase ref = parser.lookupVariable(_variableName);
if (ref == null) ref = (VariableBase)stable.lookupName(_variableName);
if (ref == null) {
reportError();
return null;
}
// Insert the referenced variable as something the parent variable
// is dependent of (this class should only be used under variables)
if ((_var = findParentVariable()) != null) _var.addDependency(ref);
// Instanciate a true variable/parameter ref
if (ref instanceof Variable)
return(new VariableRef((Variable)ref));
else if (ref instanceof Param)
return(new ParameterRef((Param)ref));
else
return null;
}
public Type typeCheck(SymbolTable stable) throws TypeCheckError {
if (_ref != null) {
final String name = _variableName.toString();
ErrorMsg err = new ErrorMsg(ErrorMsg.CIRCULAR_VARIABLE_ERR,
name, this);
}
if ((_ref = resolve(getParser(), stable)) != null) {
return (_type = _ref.typeCheck(stable));
}
throw new TypeCheckError(reportError());
}
public void translate(ClassGenerator classGen, MethodGenerator methodGen) {
if (_ref != null)
_ref.translate(classGen, methodGen);
else
reportError();
}
public String toString() {
return "unresolved-ref()";
}
}
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